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Old 08-04-2010, 01:43 PM   #1
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Gremlins

All summer I've been driving my Georgetown on all kinds of roads going to Motorcycle Events. Everything was working fine; no problems. The past two weeks it's been sitting in the garage ; resting ; waiting for the next rally. I took it down to fill it full of gas (3 miles smooth roads); filled up the water tank and put it back in the garage. As usual; I do a walk through to make sure all the lights and water pump are turned off. I opened the door on the fridge (it wasn't turned on) and just for the heck of it I pushed the power on button. No power; no lights; nothing! Now the darn thing worked all summer; and it worked last week when I walked by and hit the switch. Checked all the fuses ;;all ok. Took off the outside vent; removed the control box cover and checked the fuse; it was also ok. Got a voltmeter and checked for power. Stared at it for a few minutes; went back in the house and searched the web for fridge problems. Bottom line seemed to be a loss of 12 volt power or a circuit board. Went back out; retraced everything I just did. Still no power.
Just before I was ready to call a repair shop; I took a screwdriver; opened up the panel in the bedroom and tightened all the 12 volt wires leading to the fuse panel. I went back outside and pushed on every connection on the circuit board. Tried the fridge again and lo and behold I had power again.
So it was either the wires in the fuse panel or the connections at the circuit board that were just loose enough to cause a problem. Go figure why things break while sitting. At least I avoided a repair bill.
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Old 08-04-2010, 01:46 PM   #2
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There have been reports of the push on connectors in the outside control box corroding and causing a bad connection. That sounds like your problem and when you moved everything around it scraped off enough of the corrosion to make contact.
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Old 08-04-2010, 02:31 PM   #3
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The temperature inside the TT is probably swinging wildly from hot to cold each day and night it's just sitting there. The resultant expansion and contraction can lead to loose connections if they weren't very solid to begin with.
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Old 08-04-2010, 05:13 PM   #4
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Corrosion and all the movements can bring on those Gremlins!
I lost my headlights one morning. They worked the last time I drove the motorhome but a few weeks later I planned to leave before daylight. Started it up and no headlights. Had running lights but no headlights. Traced it out to be the ground to the headlights. FR used an aluminum self tapping trim screw with an over-sized washer. This would have been ok if they would have removed some of the paint in the area of the washer and screw. The only thing completing the ground was the threads on the screw and it had corroded. I wire wheeled off some of the paint, drilled a hole through the frame and bolted that sucker on. Then sprayed battery terminal protector over it. No problems since. If this is as bad as it gets I'm happy.
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Old 08-04-2010, 08:18 PM   #5
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Great detective work. Good to hear you figured out the problem before it became a huge repair bill. Have a great trip on your next outing.
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Old 08-05-2010, 04:25 PM   #6
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Gremlins are back and they won. I tried the fridge again today and it didn't work again. There seems to be a loose contact on the control board. I ordered a new board today. I have a question I hope someone can answer. I can get everything to work by jiggling on the contacts. However, the interior light in the fridge won't come on. I have power to the top panel (the temp gauge works as does the auto.gas button. The fridge works just as before the problem; both on propane and ac. I checked for power at the contact coming out of the control board and it shows 12 volt. The green wire connected to the board also shows 12 volt. This wire goes through the back of the fridge. The door switch has two wires on one side and a single red wire on the other side. I have no power at the switch nor the light. I don't think the control panel has anything to do with the interior light. Can anyone tell me what could be wrong? The fuses are ok and the bulb is good.
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Old 08-05-2010, 04:38 PM   #7
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There should be +12 volts to the bulb at all times when the fridge is turned on. Use a volt meter to check both contacts on the fixture and use the cooling fins at the back of the fridge for ground. The switch itself to turn on the bulb has no voltage on it, it only switches the negative side.
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Old 08-05-2010, 07:29 PM   #8
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I checked the voltage at the bulb and there is none. There is a green wire (12 volt) coming from the control board that goes inside the back of the fridge. At the bulb there is a red wire attached to one side of the bulb and two black wires attached to the other side. I know I should have 12 volts on the red side; but nothing. Does the green wire that goes into the back of the fridge branch off into the red wire and the black wires? There has to be a problem in these wires but I can't see as they are behind the fridge wall. I don't think the control board would prevent the interior light from working as long as the power to the fridge is on. I know that the interior light only works when the fridge is turned on. Now it doesn't work even with everything else working ok. If only I knew for sure that the control board wasn't causing this.
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Old 08-05-2010, 10:31 PM   #9
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Yep, sorry, without some hands on time I am at a loss. One word of caution when troubleshooting RV electrical problems: do not assume by wire color that you have positive or negative. In other words just because a wire is red doesn't mean it is +12volts and just because it is black doesn't mean its ground either. I have seen a lot of wacked out colors used in RV wiring that just doesn't seem to make sense. Hopefully the new board will help. Hope you didn't buy the OEM replacement though.
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Old 08-06-2010, 10:51 AM   #10
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What is the model number of your unit?

On our unit the light power comes from the control board on J2 as a red wire and goes thru the switch to the light and leaves the light as a black wire and goes to the common ground on the control board.

Here's a place you can download manuals for Dometic fridges.
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